leanken commented on a change in pull request #30296:
URL: https://github.com/apache/spark/pull/30296#discussion_r519786679
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
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@@ -1966,7 +1966,20 @@ case class ElementAt(left: Expression, right: Expression)
}
override def nullable: Boolean = left.dataType match {
- case _: ArrayType => computeNullabilityFromArray(left, right)
+ case _: ArrayType =>
+ def specialNormalizeIndex: (Int, Int) => Int = {
+ (arrayLength: Int, index: Int) => {
+ if (index < 0) {
+ arrayLength + index
Review comment:
calling nullable will not get exception or failed, if it's out of
bounds, it's just returning a default true.
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